53 results about "Acetonedicarboxylic acid" patented technology

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 1,3-cyclohexanedione. The preparation method of the 1,3-cyclohexanedione comprises the following steps: with 1,3-acetonedicarboxylic ester and acrylate as raw materials, carrying out condensation and cyclization under the action of a base catalyst to prepare an intermediate; carrying out hydrolysis decarboxylation on the intermediate to obtain a crude product; and recrystallizing the crude product to obtain the 1,3-cyclohexanedione. The preparation method of the 1,3-cyclohexanedione hasthe advantages that process conditions are convenient to realize, post-treatment operation process is simple, yield is as high as 90.9%, reaction selectivity is high, production efficiency is high, operation safety is high, pollution is small, and the preparation method is suitable for industrial scale production.

The invention discloses a synthesis method of a natural product of E-2,3',4,5'-tetrahydroxy diphenyl ethylene. According to the method, 1,3-acetone dicarboxylic acid dimethyl ester is used as a starting raw material; condensation and aromatization reactions are performed to obtain 3,5-dihydroxy-2,4-dicarboxylate methyl phenyl acetate; then, hydrolysis and decarboxylation are performed to obtain 3,5-dyhydroxy phenylacetic acid; the 3,5-dyhydroxy phenylacetic acid and 2,4-dihydroxy benzaldehyde take condensation reaction under the existence of alkali to obtain 3-(3,5-dihydroxy phenyl)-7-hydroxy coumarin; next, open loop decarboxylation reaction is performed under the alkaline condition; the natural product of E-2,3',4,5'-tetrahydroxy diphenyl ethylene is obtained. The method has the advantages that the raw materials are easily obtained; the reaction route is simple and fast; the operation is convenient; the yield is higher.

The invention discloses a preparation method of an improved low-smoke halogen-free cable rubber jacket. The preparation method includes following steps: A, using EPDM rubber, methyl vinyl silicon rubber, 1, 3-acetone dicarboxylic acid diethyl ester, tetrabutyl ammonium hydrogen phosphate, dimethyl urea, m-caborane, 3-methoxy benzene methanol, 3-nitro-4-aminophenol, calcium sulfate, carbon black and zirconium oxide to preparing a cable inner jacket; B, using polyethylene, EVA rersin, EDTA, dicumyl peroxide, triethanolamine, tertbutyl isosulfate, 3-nitro-4-methyl acetophenone, potassium hydrogen sulfate, dibutyl fumarate and benzoyl acetonitrile to prepare a cable outer jacket; C, socketing the cable inner jacket prepared in the step A and the cable outer jacket prepared in the step B, and filling a flame retardant between the cable inner jacket and the cable outer jacket. By the preparation method, the defects of the prior art can be overcome, and mechanical performance of cables is improved further.

The invention discloses a method for determining the content of acetonedicarboxylic acid in a sodium citrate solution. The method comprises the following steps of: 1) preparing a system applicable solution, specifically, taking a proper amount of acetonedicarboxylic acid reference substance and a proper amount of citric acid reference substance, dissolving the acetonedicarboxylic acid reference substance and the citric acid reference substanceby using a mobile phase, and diluting an obtained solution to prepare a solution containing about 100 micrograms of citric acid and 100 micrograms of acetonedicarboxylic acid per 1ml; 2) preparing a test solution, specifically, precisely measuring 2ml of a 2.5% sodium citrate solution, placing the 2.5% sodium citrate solution in a 10ml measuring flask, diluting the 2.5% sodium citrate solution to a scale by using a mobile phase, and performing uniform shaking; and 3) preparing a reference substance solution, specifically, taking a proper amount of an acetonedicarboxylic acid reference substance, dissolving the acetonedicarboxylic acid reference substance with a mobile phase, and diluting an obtained solution to prepare a solution containing about 100 microgramsof acetonedicarboxylic acid per 1ml. According to the method, the content of the acetonedicarboxylic acid in the sodium citrate solution is measured through the high performance liquid chromatography, so that main degradation products of the sodium citrate solution are controlled, the process conditions and storage conditions of the sodium citrate solution are favorably controlled, and meanwhile, the yield in the synthesis process of the acetonedicarboxylic acid can be accurately obtained.

The invention relates to a method for preparing modified PEF copolyester by using 2, 3-diphenyl-diethyl terephthalate, which is used for preparing the PEF copolyester by using dimethyl acetone dicarboxylate and cinnamyl aldehyde as raw materials and zinc acetate and antimonous oxide as catalysts under the conditions of high temperature and high vacuum, and comprises the following steps: 1) preparing the 2, 3-diphenyl-diethyl terephthalate from the diethyl acetone dicarboxylate; and 2) preparing the modified PEF copolyester from the 2, 3-diphenyl-diethyl terephthalate. The preparation method has the advantages that the PEF polyester is wide in raw material source, low in price, renewable and low in production cost; the PEF polyester modification synthesis process is simple, easy to operate,environmentally friendly, high in yield and beneficial to industrial production; the prepared modified PEF copolyester material is good in thermal stability and adjustable in performance, structure and function diversification is easy to achieve, the performance of the modified PEF copolyester material can be comparable with that of polyester based on petroleum raw materials, and the modified PEFcopolyester material has the possibility of large-scale production.

The invention discloses a methanol gasoline stabilizer. The methanol gasoline stabilizer is formed by mixing the following components in percentage by mass: 18.0 to 31.0 percent of 2-octylame, 15.0 to 29.5 percent of N-tert-butyl-piperazine, 15.0 to 24.5 percent of 4-N-butoxy-benzonitrile, 13.0 to 24.0 percent of allyl phenoxyacetate, 10.0 to 20.5 percent of 1,3-acetone dicarboxylate, and 9.0 to 19.5 percent of 3-dimethyl aminoanisole. Before methanol gasoline is prepared, first, 0.4 to 0.8 mass percent of the stabilizer disclosed by the invention is added to the methanol, and the methanol and the stabilizer are mixed uniformly, and then, performing subsequent processes of preparing the methanol gasoline after ultrasonic treatment is performed at a normal temperature. The improvement effect of the storage stability of the methanol gasoline using the methanol gasoline stabilizer disclosed by the invention is remarkable; the anti-water separation performance is improved obviously; through engine stand and actual road driving tests, the gasoline consumption, the output power, the tail gas emission and the like of the methanol gasoline are equivalent to those of the methanol gasoline with the same grade.

The invention relates to a total synthesis method of a natural active product concentricolide and its analogue. The total synthesis method is a universal, simple and effective racemic and asymmetric total synthesis method. The total synthesis method comprises that a 1,3-acetone dicarboxylate compound as a raw material and alkynal undergo a Michael-Aldol reaction to produce a phenyl compound of which the benzene ring contains a phenolic hydroxyl group; through a substitution reaction of the phenolic hydroxyl group and a halogenated carboxylate, and benzyl bit oxidation and reduction reactions, benzofuranone lactone is constructed; under the alkaline condition, through a Diekmann condensation reaction and a Krapho reaction, a benzofuran ring is constructed; and through a series of functional group conversion, racemic total synthesis of the natural active product concentricolide and its analogue is realized. The total synthesis method utilizes a chiral reagent to catalytically reduce a carbonyl group or a double bond thereby constructing a corresponding chiral center so that asymmetric total synthesis of the natural active product concentricolide and its analogue is realized.

The invention discloses a method for identifying aliphatic chain isomers α-ketoglutaric acid and 1,3-acetone dicarboxylic acid, which is characterized in that: using "H2SO4-KIO3-[NiL](ClO4) 2‑MA‑H2O2” nonlinear chemical oscillation system is used as the identification solution, and the identification of aliphatic chain isomers can be realized according to the oscillation response of the aliphatic chain isomers to the system; L in [NiL](ClO4)2 is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazatetradec-4,11-diene. The oscillation spectrum provided by this identification method is more intuitive, not only can easily and quickly identify the aliphatic chain isomers α-ketoglutaric acid and 1,3-acetone dicarboxylic acid, but also can be widely used In other isomers, and the equipment is simple, high accuracy, easy to operate and observe.